add mouse zoom example (#2583)

examples/Makefile

@@ -375,6 +375,7 @@ CORE = \
     core/core_input_gestures \
     core/core_2d_camera \
     core/core_2d_camera_platformer \
+	core/core_2d_camera_mouse_zoom \
     core/core_3d_camera_mode \
     core/core_3d_camera_free \
     core/core_3d_camera_first_person \

examples/core/core_2d_camera_mouse_zoom.c

@@ -0,0 +1,101 @@
+/*******************************************************************************************
+*
+*   raylib [core] example - 2d camera mouse zoom
+*
+*   This example has been created using raylib 1.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2022 Jeffery Myers
+*
+********************************************************************************************/
+
+
+#include "raylib.h"
+#include "rlgl.h"
+#include "raymath.h";
+
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main ()
+{
+	// Initialization
+	//--------------------------------------------------------------------------------------
+	const int screenWidth = 800;
+	const int screenHeight = 450;
+
+	InitWindow(screenWidth, screenHeight, "raylib [core] example - 2d camera mouse zoom");
+
+	Camera2D camera = { 0 };
+	camera.zoom = 1;
+
+	SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
+	//--------------------------------------------------------------------------------------
+
+	// Main game loop
+	while (!WindowShouldClose())
+	{
+		// translate based on right click
+		if (IsMouseButtonDown(MOUSE_BUTTON_RIGHT))
+		{
+			Vector2 delta = GetMouseDelta();
+			delta = Vector2Scale(delta, -1.0f / camera.zoom);
+
+			camera.target = Vector2Add(camera.target, delta);
+		}
+
+		// zoom based on wheel
+		float wheel = GetMouseWheelMove();
+		if (wheel != 0)
+		{
+			// get the world point that is under the mouse
+			Vector2 mouseWorldPos = GetScreenToWorld2D(GetMousePosition(), camera);
+			
+			// set the offset to where the mouse is
+			camera.offset = GetMousePosition();
+
+			// set the target to match, so that the camera maps the world space point under the cursor to the screen space point under the cursor at any zoom
+			camera.target = mouseWorldPos;
+
+			// zoom
+			const float zoomIncrement = 0.125f;
+
+			camera.zoom += wheel * zoomIncrement;
+			if (camera.zoom < zoomIncrement)
+				camera.zoom = zoomIncrement;
+		}
+
+		//----------------------------------------------------------------------------------
+
+		// Draw
+		//----------------------------------------------------------------------------------
+		BeginDrawing();
+		BeginDrawing();
+		ClearBackground(BLACK);
+
+		BeginMode2D(camera);
+
+		// draw the 3d grid, rotated 90 degrees and centered around 0,0 just so we have something in the XY plane
+        rlPushMatrix();
+        rlTranslatef(0, 25 * 50, 0);
+        rlRotatef(90, 1, 0, 0);
+        DrawGrid(100, 50);
+        rlPopMatrix();
+
+		// draw a thing
+		DrawCircle(100, 100, 50, YELLOW);
+		EndMode2D();
+
+		DrawText("Right drag to move, mouse wheel to zoom", 2, 2, 20, WHITE);
+		
+		EndDrawing();
+		//----------------------------------------------------------------------------------
+	}
+
+	// De-Initialization
+    //--------------------------------------------------------------------------------------
+	CloseWindow();        // Close window and OpenGL context
+	//--------------------------------------------------------------------------------------
+	return 0;
+}

projects/VS2022/examples/core_2d_camera_mouse_zoom.vcxproj

@@ -0,0 +1,390 @@
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+      <Command>xcopy /y /d  "$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\raylib.dll" "$(SolutionDir)\build\$(ProjectName)\bin\$(Platform)\$(Configuration)"</Command>
+    </PostBuildEvent>
+    <PostBuildEvent>
+      <Message>Copy Release DLL to output directory</Message>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\examples\core\core_2d_camera_mouse_zoom.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="..\..\..\src\raylib.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\raylib\raylib.vcxproj">
+      <Project>{e89d61ac-55de-4482-afd4-df7242ebc859}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

projects/VS2022/raylib.sln

@@ -251,6 +251,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "textures_fog_of_war", "exam
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "textures_gif_player", "examples\textures_gif_player.vcxproj", "{191A5289-BA65-4638-A215-C521F0187313}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "core_2d_camera_mouse_zoom", "examples\core_2d_camera_mouse_zoom.vcxproj", "{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug.DLL|x64 = Debug.DLL|x64
@@ -2099,6 +2101,22 @@ Global
 		{191A5289-BA65-4638-A215-C521F0187313}.Release|x64.Build.0 = Release|x64
 		{191A5289-BA65-4638-A215-C521F0187313}.Release|x86.ActiveCfg = Release|Win32
 		{191A5289-BA65-4638-A215-C521F0187313}.Release|x86.Build.0 = Release|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug.DLL|x64.ActiveCfg = Debug.DLL|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug.DLL|x64.Build.0 = Debug.DLL|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug.DLL|x86.ActiveCfg = Debug.DLL|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug.DLL|x86.Build.0 = Debug.DLL|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug|x64.ActiveCfg = Debug|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug|x64.Build.0 = Debug|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug|x86.ActiveCfg = Debug|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Debug|x86.Build.0 = Debug|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release.DLL|x64.ActiveCfg = Release.DLL|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release.DLL|x64.Build.0 = Release.DLL|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release.DLL|x86.ActiveCfg = Release.DLL|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release.DLL|x86.Build.0 = Release.DLL|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release|x64.ActiveCfg = Release|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release|x64.Build.0 = Release|x64
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release|x86.ActiveCfg = Release|Win32
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -2226,6 +2244,7 @@ Global
 		{3FE7E9B6-49AC-4246-A789-28DB4644567B} = {6C82BAAE-BDDF-457D-8FA8-7E2490B07035}
 		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0} = {DA049009-21FF-4AC0-84E4-830DD1BCD0CE}
 		{191A5289-BA65-4638-A215-C521F0187313} = {DA049009-21FF-4AC0-84E4-830DD1BCD0CE}
+		{3CFF7AB8-32CB-4D6D-9FED-53DBEF277359} = {6C82BAAE-BDDF-457D-8FA8-7E2490B07035}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {E926C768-6307-4423-A1EC-57E95B1FAB29}